TY - JOUR
T1 - Mechanisms of Andreev reflection in quantum Hall graphene
AU - Manesco, Antonio L.R.
AU - Flór, Ian Matthias
AU - Liu, Chun Xiao
AU - Akhmerov, Anton R.
PY - 2022
Y1 - 2022
N2 - We simulate a hybrid superconductor-graphene device in the quantum Hall regime to identify the origin of downstream resistance oscillations in a recent experiment [Zhao et al. Nature Physics 16, (2020)]. In addition to the previously studied Mach-Zehnder interference between the valley-polarized edge states, we consider disorder-induced scattering, and the appearance of the counter-propagating states generated by the interface density mismatch. Comparing our results with the experiment, we conclude that the observed oscillations are induced by the interfacial disorder, and that lattice-matched superconductors are necessary to observe the alternative ballistic effects.
AB - We simulate a hybrid superconductor-graphene device in the quantum Hall regime to identify the origin of downstream resistance oscillations in a recent experiment [Zhao et al. Nature Physics 16, (2020)]. In addition to the previously studied Mach-Zehnder interference between the valley-polarized edge states, we consider disorder-induced scattering, and the appearance of the counter-propagating states generated by the interface density mismatch. Comparing our results with the experiment, we conclude that the observed oscillations are induced by the interfacial disorder, and that lattice-matched superconductors are necessary to observe the alternative ballistic effects.
UR - http://www.scopus.com/inward/record.url?scp=85140367411&partnerID=8YFLogxK
U2 - 10.21468/SCIPOSTPHYSCORE.5.3.045
DO - 10.21468/SCIPOSTPHYSCORE.5.3.045
M3 - Article
AN - SCOPUS:85140367411
SN - 2666-9366
VL - 5
JO - SciPost Physics Core
JF - SciPost Physics Core
IS - 3
M1 - 045
ER -